With Minnesota in the news, I was reminded of how much American politics has changed during my lifetime. In the 1984 election, Minnesota was the only blue state. That's partly because Walter Mondale was from Minnesota, but not entirely. In the 1988 election, the Dems won Minnesota by 7 points vs. only 4 points in New York, while California actually went red. Millennial readers might be shocked to know that Iowa was the second bluest state in the 1988 election,...